Today's Message Index:
----------------------
1. 07:46 AM - Re: Re: Magnetic heading sensor (ZH-4) (Greg Wrobel)
2. 08:39 AM - Re: Re: Magnetic heading sensor (ZH-4) (Tom Elliott)
3. 11:13 AM - Re: Re: Magnetic heading sensor (ZH-4) (Walter Lannon)
4. 11:24 AM - Re: Re: Magnetic heading sensor (ZH-4) (Richard Goode)
5. 11:25 AM - Re: Re: Magnetic heading sensor (ZH-4) (Justin Drafts)
6. 11:31 AM - Re: Re: Magnetic heading sensor (ZH-4) (Richard Hess)
7. 01:37 PM - Re: Re: Magnetic heading sensor (ZH-4) (Justin Drafts)
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| Subject: | Re: Magnetic heading sensor (ZH-4) |
I have the exact same issue. Tried cleaning the plugs and not much help.
The other day it was back to normal for one flight and now 40-60 degrees
off again. Not that I use it much but I like everything working correctly
in my airplane. I will continue to explore the system and share with you if
I have a miraculous discovery.
Greg "Clouddog " Wrobel
On Wed, Apr 29, 2020, 00:42 Justin Drafts <draftsjust417@gmail.com> wrote:
> Excellent background & info, much appreciated Walt!
>
> Not having looked at the GHC-2 in years, I presume there's a
> straightforward way to check/service the fluid?
>
> (Will also clean all the cannon plugs.) -Justin
>
> On Wed, Apr 29, 2020 at 8:59 AM Walter Lannon <wlannon@shaw.ca> wrote:
>
>> Hi Justin;
>>
>> The Gyro stabilized magnetic compass system in the CJ is a complex
>> =9Cgyrosyn=9D system most of which I am certainly not qualif
ied to give any
>> guidance on with one possible exception.
>>
>> The primary unit (GHC-2) unlike more modern systems is in fact a very
>> large and very accurate WET magnetic compass. It=99s output is fe
d through
>> the stabilizing gyro which corrects turning errors, etc. before display
on
>> the cockpit indicator. It looks, not surprisingly, like a WW2 era Briti
sh
>> unit. As such it does require some periodic maintenance.
>>
>> Your problem of course may be electrical in nature in, or between, any
>> one of the three units. But it could also be a purely magnetic compass
>> problem like loss of fluid or fluid contamination over the years. I hav
e
>> known people to top-up or re-fill a compass with petroleum solvent (Vars
ol,
>> Stoddard, etc.) since it looks and smells like compass fluid. It is als
o
>> loaded with bacteria that over time can gum up a compass.
>> Compass fluid is basically kerosene, triple distilled to kill the bugs.
>> Don=99t use anything else.
>>
>> Unlike your standby compass this one takes a lot of fluid!
>>
>> Cheers;
>> Walt
>>
>>
>> *From:* Justin Drafts <draftsjust417@gmail.com>
>> *Sent:* Tuesday, April 28, 2020 2:38 PM
>> *To:* yak-list@matronics.com
>> *Subject:* Yak-List: Re: Magnetic heading sensor (ZH-4)
>>
>> Ok, in this season of electrical gremlins for me, I have a fresh
>> issue that's just come up...
>>
>> My magnetic heading indicator (p/n *ZH-4*) in the fwd cockpit has always
>> read
>> flawlessly when compared w/ wet compass, and it's snapped to attention
>> when I depress the small "Synch" button above it. My mag heading sensor
>> unit (p/n *GHC-2*) is back in the empennage.
>>
>> Lately it's been reading 30- 45 deg off from the wet compass.
>>
>> Fixing a loose wire in the synch switch hasn't improved it's accuracy.
>> Otherwise I haven't touched anything.
>>
>> Other ideas for adjusting or correcting the issue?
>> Are there adjustments on the sensor in the tail?
>>
>> Inputs, experiences, and advice welcome!
>>
>> Thanks-
>> Justin Drafts
>> N280NC
>>
>>
>>
>>
>>
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>>
>> This email has been checked for viruses by Avast antivirus software.
>> www.avast.com <https://www.avast.com/antivirus>
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>> <#m_9143583552633769015_m_920027706031010472_DAB4FAD8-2DD7-40BB-A1B8-4E2
AA1F9FDF2>
>>
>
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| Subject: | Re: Magnetic heading sensor (ZH-4) |
Remember that there is two vacuum tubes in the slaving amplifier. And they
wear out with use / age.
Tom Elliott
CJ-6A NX63727
777 Quartz Ave
PMB 7004
Sandy Valley NV.
89019
Cell 541-297-5497
N13472@AOL.COM
From: owner-yak-list-server@matronics.com [mailto:owner-yak-list-server@mat
ronics.com] On Behalf Of Greg Wrobel
Sent: Wednesday, April 29, 2020 7:45 AM
Subject: Re: Yak-List: Re: Magnetic heading sensor (ZH-4)
I have the exact same issue. Tried cleaning the plugs and not much help. Th
e other day it was back to normal for one flight and now 40-60 degrees off
again. Not that I use it much but I like everything working correctly in m
y airplane. I will continue to explore the system and share with you if I h
ave a miraculous discovery.
Greg "Clouddog " Wrobel
On Wed, Apr 29, 2020, 00:42 Justin Drafts <draftsjust417@gmail.com> wrote:
Excellent background & info, much appreciated Walt!
Not having looked at the GHC-2 in years, I presume there's a straightforwar
d way to check/service the fluid?
(Will also clean all the cannon plugs.) -Justin
On Wed, Apr 29, 2020 at 8:59 AM Walter Lannon <wlannon@shaw.ca> wrote:
Hi Justin;
The Gyro stabilized magnetic compass system in the CJ is a complex
=9Cgyrosyn=9D system most of which I am certainly not qualified to gi
ve any guidance on with one possible exception.
The primary unit (GHC-2) unlike more modern systems is in fact a very large
and very accurate WET magnetic compass. It=99s output is fed throug
h the stabilizing gyro which corrects turning errors, etc. before display
on the cockpit indicator. It looks, not surprisingly, like a WW2 era Briti
sh unit. As such it does require some periodic maintenance.
Your problem of course may be electrical in nature in, or between, any one
of the three units. But it could also be a purely magnetic compass problem
like loss of fluid or fluid contamination over the years. I have known pe
ople to top-up or re-fill a compass with petroleum solvent (Varsol, Stoddar
d, etc.) since it looks and smells like compass fluid. It is also loaded w
ith bacteria that over time can gum up a compass.
Compass fluid is basically kerosene, triple distilled to kill the bugs. D
on=99t use anything else.
Unlike your standby compass this one takes a lot of fluid!
Cheers;
Walt
From: Justin Drafts <mailto:draftsjust417@gmail.com>
Sent: Tuesday, April 28, 2020 2:38 PM
Subject: Yak-List: Re: Magnetic heading sensor (ZH-4)
Ok, in this season of electrical gremlins for me, I have a fresh
issue that's just come up...
My magnetic heading indicator (p/n ZH-4) in the fwd cockpit has always read
flawlessly when compared w/ wet compass, and it's snapped to attention
when I depress the small "Synch" button above it. My mag heading sensor
unit (p/n GHC-2) is back in the empennage.
Lately it's been reading 30- 45 deg off from the wet compass.
Fixing a loose wire in the synch switch hasn't improved it's accuracy.
Otherwise I haven't touched anything.
Other ideas for adjusting or correcting the issue?
Are there adjustments on the sensor in the tail?
Inputs, experiences, and advice welcome!
Thanks-
Justin Drafts
N280NC
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| Subject: | Re: Magnetic heading sensor (ZH-4) |
Good point Tom.
I had forgotten about the amplifier.
Walt
From: Tom Elliott
Sent: Wednesday, April 29, 2020 8:37 AM
Subject: RE: Yak-List: Re: Magnetic heading sensor (ZH-4)
Remember that there is two vacuum tubes in the slaving amplifier. And they
wear out with use / age.
Tom Elliott
CJ-6A NX63727
777 Quartz Ave
PMB 7004
Sandy Valley NV.
89019
Cell 541-297-5497
N13472@AOL.COM
From: owner-yak-list-server@matronics.com [mailto:owner-yak-list-server@mat
ronics.com] On Behalf Of Greg Wrobel
Sent: Wednesday, April 29, 2020 7:45 AM
Subject: Re: Yak-List: Re: Magnetic heading sensor (ZH-4)
I have the exact same issue. Tried cleaning the plugs and not much help. Th
e other day it was back to normal for one flight and now 40-60 degrees off
again. Not that I use it much but I like everything working correctly in m
y airplane. I will continue to explore the system and share with you if I h
ave a miraculous discovery.
Greg "Clouddog " Wrobel
On Wed, Apr 29, 2020, 00:42 Justin Drafts <draftsjust417@gmail.com> wrote:
Excellent background & info, much appreciated Walt!
Not having looked at the GHC-2 in years, I presume there's a straightforw
ard way to check/service the fluid?
(Will also clean all the cannon plugs.) -Justin
On Wed, Apr 29, 2020 at 8:59 AM Walter Lannon <wlannon@shaw.ca> wrote:
Hi Justin;
The Gyro stabilized magnetic compass system in the CJ is a complex
=9Cgyrosyn=9D system most of which I am certainly not qualified to
give any guidance on with one possible exception.
The primary unit (GHC-2) unlike more modern systems is in fact a very l
arge and very accurate WET magnetic compass. It=99s output is fed th
rough the stabilizing gyro which corrects turning errors, etc. before disp
lay on the cockpit indicator. It looks, not surprisingly, like a WW2 era B
ritish unit. As such it does require some periodic maintenance.
Your problem of course may be electrical in nature in, or between, any
one of the three units. But it could also be a purely magnetic compass pro
blem like loss of fluid or fluid contamination over the years. I have know
n people to top-up or re-fill a compass with petroleum solvent (Varsol, Sto
ddard, etc.) since it looks and smells like compass fluid. It is also load
ed with bacteria that over time can gum up a compass.
Compass fluid is basically kerosene, triple distilled to kill the bugs.
Don=99t use anything else.
Unlike your standby compass this one takes a lot of fluid!
Cheers;
Walt
From: Justin Drafts
Sent: Tuesday, April 28, 2020 2:38 PM
To: yak-list@matronics.com
Subject: Yak-List: Re: Magnetic heading sensor (ZH-4)
Ok, in this season of electrical gremlins for me, I have a fresh
issue that's just come up...
My magnetic heading indicator (p/n ZH-4) in the fwd cockpit has always
read
flawlessly when compared w/ wet compass, and it's snapped to attention
when I depress the small "Synch" button above it. My mag heading sensor
unit (p/n GHC-2) is back in the empennage.
Lately it's been reading 30- 45 deg off from the wet compass.
Fixing a loose wire in the synch switch hasn't improved it's accuracy.
Otherwise I haven't touched anything.
Other ideas for adjusting or correcting the issue?
Are there adjustments on the sensor in the tail?
Inputs, experiences, and advice welcome!
Thanks-
Justin Drafts
N280NC
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| Subject: | Re: Magnetic heading sensor (ZH-4) |
I apologise for asking what might seem to be a silly question, but is
there any reason not to navigate with a simple, traditional compass?
Why make life more complicated than is absolutely necessary?
RICHARD GOODE AEROBATICS
Rhodds Farm, Lyonshall, Hereford, HR5 3LW, UK
Tel: +44 (0)1544 340120 Fax: +44 (0)1544 340129
e-mail: richard.goode@russianaeros.com
<mailto:richard.goode@russianaeros.com>
<http://www.russianaeros.com> www.russianaeros.com
WORLD LEADERS IN RUSSIAN SPORTING AIRCRAFT & ENGINES
In partnership with Aerometal Kft, Hungary.
From: owner-yak-list-server@matronics.com
<owner-yak-list-server@matronics.com> On Behalf Of Greg Wrobel
Sent: 29 April 2020 15:45
Subject: Re: Yak-List: Re: Magnetic heading sensor (ZH-4)
I have the exact same issue. Tried cleaning the plugs and not much help.
The other day it was back to normal for one flight and now 40-60 degrees
off again. Not that I use it much but I like everything working
correctly in my airplane. I will continue to explore the system and
share with you if I have a miraculous discovery.
Greg "Clouddog " Wrobel
On Wed, Apr 29, 2020, 00:42 Justin Drafts <draftsjust417@gmail.com
<mailto:draftsjust417@gmail.com> > wrote:
Excellent background & info, much appreciated Walt!
Not having looked at the GHC-2 in years, I presume there's a
straightforward way to check/service the fluid?
(Will also clean all the cannon plugs.) -Justin
On Wed, Apr 29, 2020 at 8:59 AM Walter Lannon <wlannon@shaw.ca
<mailto:wlannon@shaw.ca> > wrote:
Hi Justin;
The Gyro stabilized magnetic compass system in the CJ is a complex
=9Cgyrosyn=9D system most of which I am certainly not
qualified to give any guidance on with one possible exception.
The primary unit (GHC-2) unlike more modern systems is in fact a very
large and very accurate WET magnetic compass. It=99s output is
fed through the stabilizing gyro which corrects turning errors, etc.
before display on the cockpit indicator. It looks, not surprisingly,
like a WW2 era British unit. As such it does require some periodic
maintenance.
Your problem of course may be electrical in nature in, or between, any
one of the three units. But it could also be a purely magnetic compass
problem like loss of fluid or fluid contamination over the years. I
have known people to top-up or re-fill a compass with petroleum solvent
(Varsol, Stoddard, etc.) since it looks and smells like compass fluid.
It is also loaded with bacteria that over time can gum up a compass.
Compass fluid is basically kerosene, triple distilled to kill the bugs.
Don=99t use anything else.
Unlike your standby compass this one takes a lot of fluid!
Cheers;
Walt
From: Justin Drafts <mailto:draftsjust417@gmail.com>
Sent: Tuesday, April 28, 2020 2:38 PM
Subject: Yak-List: Re: Magnetic heading sensor (ZH-4)
Ok, in this season of electrical gremlins for me, I have a fresh
issue that's just come up...
My magnetic heading indicator (p/n ZH-4) in the fwd cockpit has always
read
flawlessly when compared w/ wet compass, and it's snapped to attention
when I depress the small "Synch" button above it. My mag heading sensor
unit (p/n GHC-2) is back in the empennage.
Lately it's been reading 30- 45 deg off from the wet compass.
Fixing a loose wire in the synch switch hasn't improved it's accuracy.
Otherwise I haven't touched anything.
Other ideas for adjusting or correcting the issue?
Are there adjustments on the sensor in the tail?
Inputs, experiences, and advice welcome!
Thanks-
Justin Drafts
N280NC
_____
<https://www.avast.com/antivirus>
This email has been checked for viruses by Avast antivirus software.
www.avast.com <https://www.avast.com/antivirus>
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| Subject: | Re: Magnetic heading sensor (ZH-4) |
Ditto, good point Tom, thanks!
J
On Wed, Apr 29, 2020 at 10:50 PM Walter Lannon <wlannon@shaw.ca> wrote:
> Good point Tom.
>
> I had forgotten about the amplifier.
>
> Walt
>
> *From:* Tom Elliott <n13472@aol.com>
> *Sent:* Wednesday, April 29, 2020 8:37 AM
> *To:* yak-list@matronics.com
> *Subject:* RE: Yak-List: Re: Magnetic heading sensor (ZH-4)
>
>
> Remember that there is two vacuum tubes in the slaving amplifier. And the
y
>
> wear out with use / age.
>
>
> Tom Elliott
>
> CJ-6A NX63727
>
> 777 Quartz Ave
>
> PMB 7004
>
> Sandy Valley NV.
>
> 89019
>
> Cell 541-297-5497
>
> N13472@AOL.COM
>
>
> *From:* owner-yak-list-server@matronics.com [mailto:
> owner-yak-list-server@matronics.com] *On Behalf Of *Greg Wrobel
> *Sent:* Wednesday, April 29, 2020 7:45 AM
> *To:* yak-list@matronics.com
> *Subject:* Re: Yak-List: Re: Magnetic heading sensor (ZH-4)
>
>
> I have the exact same issue. Tried cleaning the plugs and not much help.
> The other day it was back to normal for one flight and now 40-60 degrees
> off again. Not that I use it much but I like everything working correctl
y
> in my airplane. I will continue to explore the system and share with you
if
> I have a miraculous discovery.
>
>
> Greg "Clouddog " Wrobel
>
>
> On Wed, Apr 29, 2020, 00:42 Justin Drafts <draftsjust417@gmail.com> wrote
:
>
> Excellent background & info, much appreciated Walt!
>
>
> Not having looked at the GHC-2 in years, I presume there's a
> straightforward way to check/service the fluid?
>
>
> (Will also clean all the cannon plugs.) -Justin
>
>
> On Wed, Apr 29, 2020 at 8:59 AM Walter Lannon <wlannon@shaw.ca> wrote:
>
> Hi Justin;
>
>
> The Gyro stabilized magnetic compass system in the CJ is a complex
> =9Cgyrosyn=9D system most of which I am certainly not qualifi
ed to give any
> guidance on with one possible exception.
>
>
> The primary unit (GHC-2) unlike more modern systems is in fact a very
> large and very accurate WET magnetic compass. It=99s output is fed
through
> the stabilizing gyro which corrects turning errors, etc. before display
on
> the cockpit indicator. It looks, not surprisingly, like a WW2 era Britis
h
> unit. As such it does require some periodic maintenance.
>
>
> Your problem of course may be electrical in nature in, or between, any on
e
> of the three units. But it could also be a purely magnetic compass probl
em
> like loss of fluid or fluid contamination over the years. I have known
> people to top-up or re-fill a compass with petroleum solvent (Varsol,
> Stoddard, etc.) since it looks and smells like compass fluid. It is also
> loaded with bacteria that over time can gum up a compass.
>
> Compass fluid is basically kerosene, triple distilled to kill the bugs.
> Don=99t use anything else.
>
>
> Unlike your standby compass this one takes a lot of fluid!
>
>
> Cheers;
>
> Walt
>
>
> *From:* Justin Drafts <draftsjust417@gmail.com>
>
> *Sent:* Tuesday, April 28, 2020 2:38 PM
>
> *To:* yak-list@matronics.com
>
> *Subject:* Yak-List: Re: Magnetic heading sensor (ZH-4)
>
>
> Ok, in this season of electrical gremlins for me, I have a fresh
>
> issue that's just come up...
>
>
> My magnetic heading indicator (p/n *ZH-4*) in the fwd cockpit has always
> read
>
> flawlessly when compared w/ wet compass, and it's snapped to attention
>
> when I depress the small "Synch" button above it. My mag heading sensor
>
> unit (p/n *GHC-2*) is back in the empennage.
>
>
> Lately it's been reading 30- 45 deg off from the wet compass.
>
>
> Fixing a loose wire in the synch switch hasn't improved it's accuracy.
>
> Otherwise I haven't touched anything.
>
>
> Other ideas for adjusting or correcting the issue?
>
> Are there adjustments on the sensor in the tail?
>
>
> Inputs, experiences, and advice welcome!
>
>
> Thanks-
>
> Justin Drafts
>
> N280NC
>
>
> ------------------------------
>
> [image: Avast logo] <https://www.avast.com/antivirus>
>
> This email has been checked for viruses by Avast antivirus software.
> www.avast.com <https://www.avast.com/antivirus>
>
>
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| Subject: | Re: Magnetic heading sensor (ZH-4) |
There you go being all logical...
Richard Hess
C 404-964-4885
> On Apr 29, 2020, at 2:25 PM, Richard Goode <richard.goode@russianaeros.com
> wrote:
>
> =EF=BB
> I apologise for asking what might seem to be a silly question, but is ther
e any reason not to navigate with a simple, traditional compass?
>
> Why make life more complicated than is absolutely necessary?
>
>
>
RICHARD GOODE AEROBATICS
> Rhodds Farm, Lyonshall, Hereford, HR5 3LW, UK
> Tel: +44 (0)1544 340120 Fax: +44 (0)1544 340129
> e-mail: richard.goode@russianaeros.com
> www.russianaeros.com
> WORLD LEADERS IN RUSSIAN SPORTING AIRCRAFT & ENGINES
> In partnership with Aerometal Kft, Hungary.
>
> From: owner-yak-list-server@matronics.com <owner-yak-list-server@matronics
.com> On Behalf Of Greg Wrobel
> Sent: 29 April 2020 15:45
> To: yak-list@matronics.com
> Subject: Re: Yak-List: Re: Magnetic heading sensor (ZH-4)
>
> I have the exact same issue. Tried cleaning the plugs and not much help. T
he other day it was back to normal for one flight and now 40-60 degrees off a
gain. Not that I use it much but I like everything working correctly in my a
irplane. I will continue to explore the system and share with you if I have a
miraculous discovery.
>
> Greg "Clouddog " Wrobel
>
> On Wed, Apr 29, 2020, 00:42 Justin Drafts <draftsjust417@gmail.com> wrote:
> Excellent background & info, much appreciated Walt!
>
> Not having looked at the GHC-2 in years, I presume there's a straightforwa
rd way to check/service the fluid?
>
> (Will also clean all the cannon plugs.) -Justin
>
> On Wed, Apr 29, 2020 at 8:59 AM Walter Lannon <wlannon@shaw.ca> wrote:
> Hi Justin;
>
> The Gyro stabilized magnetic compass system in the CJ is a complex =9C
gyrosyn=9D system most of which I am certainly not qualified to give a
ny guidance on with one possible exception.
>
> The primary unit (GHC-2) unlike more modern systems is in fact a very larg
e and very accurate WET magnetic compass. It=99s output is fed throug
h the stabilizing gyro which corrects turning errors, etc. before display o
n the cockpit indicator. It looks, not surprisingly, like a WW2 era British
unit. As such it does require some periodic maintenance.
>
> Your problem of course may be electrical in nature in, or between, any one
of the three units. But it could also be a purely magnetic compass problem
like loss of fluid or fluid contamination over the years. I have known peo
ple to top-up or re-fill a compass with petroleum solvent (Varsol, Stoddard,
etc.) since it looks and smells like compass fluid. It is also loaded with
bacteria that over time can gum up a compass.
> Compass fluid is basically kerosene, triple distilled to kill the bugs. D
on=99t use anything else.
>
> Unlike your standby compass this one takes a lot of fluid!
>
> Cheers;
> Walt
>
>
> From: Justin Drafts
> Sent: Tuesday, April 28, 2020 2:38 PM
> To: yak-list@matronics.com
> Subject: Yak-List: Re: Magnetic heading sensor (ZH-4)
>
> Ok, in this season of electrical gremlins for me, I have a fresh
> issue that's just come up...
>
> My magnetic heading indicator (p/n ZH-4) in the fwd cockpit has always rea
d
> flawlessly when compared w/ wet compass, and it's snapped to attention
> when I depress the small "Synch" button above it. My mag heading sensor
> unit (p/n GHC-2) is back in the empennage.
>
> Lately it's been reading 30- 45 deg off from the wet compass.
>
> Fixing a loose wire in the synch switch hasn't improved it's accuracy.
> Otherwise I haven't touched anything.
>
> Other ideas for adjusting or correcting the issue?
> Are there adjustments on the sensor in the tail?
>
> Inputs, experiences, and advice welcome!
>
> Thanks-
> Justin Drafts
> N280NC
>
>
>
>
>
> <~WRD0002.jpg>
> This email has been checked for viruses by Avast antivirus software.
> www.avast.com
>
>
>
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| Subject: | Re: Magnetic heading sensor (ZH-4) |
Nope, nothing wrong at all with the tried & true wet compass...
The ex-aero engineer (=perfectionist ) in me just likes to keep existing
systems on the plane in decent working order.
There are definitely much better ways to navigate, ie a variety of
affordable GPS's, but I'm a nostalgic purist...
Justin
On Wed, Apr 29, 2020, 11:32 AM Richard Goode <richard.goode@russianaeros.co
m>
wrote:
> I apologise for asking what might seem to be a silly question, but is
> there any reason not to navigate with a simple, traditional compass?
>
>
> Why make life more complicated than is absolutely necessary?
>
>
> *
>
RICHARD
> GOODE AEROBATICS*
>
> *Rhodds Farm, Lyonshall, Hereford, HR5 3LW, UK*
>
> Tel: +44 (0)1544 340120 Fax: +44 (0)1544 340129
>
> e-mail: richard.goode@russianaeros.com
>
> www.russianaeros.com
>
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>
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> *From:* owner-yak-list-server@matronics.com <
> owner-yak-list-server@matronics.com> *On Behalf Of *Greg Wrobel
> *Sent:* 29 April 2020 15:45
> *To:* yak-list@matronics.com
> *Subject:* Re: Yak-List: Re: Magnetic heading sensor (ZH-4)
>
>
> I have the exact same issue. Tried cleaning the plugs and not much help.
> The other day it was back to normal for one flight and now 40-60 degrees
> off again. Not that I use it much but I like everything working correctl
y
> in my airplane. I will continue to explore the system and share with you
if
> I have a miraculous discovery.
>
>
> Greg "Clouddog " Wrobel
>
>
> On Wed, Apr 29, 2020, 00:42 Justin Drafts <draftsjust417@gmail.com> wrote
:
>
> Excellent background & info, much appreciated Walt!
>
>
> Not having looked at the GHC-2 in years, I presume there's a
> straightforward way to check/service the fluid?
>
>
> (Will also clean all the cannon plugs.) -Justin
>
>
> On Wed, Apr 29, 2020 at 8:59 AM Walter Lannon <wlannon@shaw.ca> wrote:
>
> Hi Justin;
>
>
> The Gyro stabilized magnetic compass system in the CJ is a complex
> =9Cgyrosyn=9D system most of which I am certainly not qualifi
ed to give any
> guidance on with one possible exception.
>
>
> The primary unit (GHC-2) unlike more modern systems is in fact a very
> large and very accurate WET magnetic compass. It=99s output is fed
through
> the stabilizing gyro which corrects turning errors, etc. before display
on
> the cockpit indicator. It looks, not surprisingly, like a WW2 era Britis
h
> unit. As such it does require some periodic maintenance.
>
>
> Your problem of course may be electrical in nature in, or between, any on
e
> of the three units. But it could also be a purely magnetic compass probl
em
> like loss of fluid or fluid contamination over the years. I have known
> people to top-up or re-fill a compass with petroleum solvent (Varsol,
> Stoddard, etc.) since it looks and smells like compass fluid. It is also
> loaded with bacteria that over time can gum up a compass.
>
> Compass fluid is basically kerosene, triple distilled to kill the bugs.
> Don=99t use anything else.
>
>
> Unlike your standby compass this one takes a lot of fluid!
>
>
> Cheers;
>
> Walt
>
>
> *From:* Justin Drafts <draftsjust417@gmail.com>
>
> *Sent:* Tuesday, April 28, 2020 2:38 PM
>
> *To:* yak-list@matronics.com
>
> *Subject:* Yak-List: Re: Magnetic heading sensor (ZH-4)
>
>
> Ok, in this season of electrical gremlins for me, I have a fresh
>
> issue that's just come up...
>
>
> My magnetic heading indicator (p/n *ZH-4*) in the fwd cockpit has always
> read
>
> flawlessly when compared w/ wet compass, and it's snapped to attention
>
> when I depress the small "Synch" button above it. My mag heading sensor
>
> unit (p/n *GHC-2*) is back in the empennage.
>
>
> Lately it's been reading 30- 45 deg off from the wet compass.
>
>
> Fixing a loose wire in the synch switch hasn't improved it's accuracy.
>
> Otherwise I haven't touched anything.
>
>
> Other ideas for adjusting or correcting the issue?
>
> Are there adjustments on the sensor in the tail?
>
>
> Inputs, experiences, and advice welcome!
>
>
> Thanks-
>
> Justin Drafts
>
> N280NC
>
>
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